OpenAI compatible API · Attested · Public status

Gemma 4 31B vs OpenAI: gpt-oss-120b

Gemma 4 31B vs gpt-oss-120b: compare current API pricing, context, provider routes, privacy, p50 latency, and OpenAI-compatible access.

Verify gateway

Onebase URL to migrate

100sof models and routes

0prompt or output logs. Always.

Compare routesProviders, price, context, and policy posture in one view.

Use auto when uptime mattersKeep a primary model and let fallback handle provider failures.

Same API shapeUse the OpenAI client and set the model you want.

Practical read

Monthly evidence

OpenAI: gpt-oss-120b has the lower cheapest prompt+completion route on TrustedRouter. OpenAI: gpt-oss-120b has more provider fallback routes, while Gemma 4 31B has the larger context window. Current TrustedRouter probes show OpenAI: gpt-oss-120b with the lower p50 TTFT.

$2.6164/1MGemma 4 31B cheapest route

$0.211/1MOpenAI: gpt-oss-120b cheapest route

790 msGemma 4 31B fastest measured p50 TTFT via cerebras

703 msOpenAI: gpt-oss-120b fastest measured p50 TTFT via together

Prices and live route measurements can change. Use the monthly reports when you need a stable evidence window, then run a small task-specific eval before choosing a production default.

Gemma 4 31BOpenAI: gpt-oss-120b

Model idcerebras/gemma-4-31bopenai/gpt-oss-120b

Publisher Cerebras OpenAI

AI IQ IQ 101#75 IQ 105#63

Context131,072 tokens131,072 tokens

Provider routes233

Cheapest route$2.6164/1M$0.211/1M

Privacy posturehas ZDR routehas provider E2EE route

Fastest measured p50 TTFT790 ms via cerebras703 ms via together

Highest measured throughputnot enough datanot enough data

Recent route uptime range100.00%100.00%

Modes chat chat

Gemma 4 31B routes

Overview2 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

OpenAI: gpt-oss-120b routes

Overview33 endpoints
PricingPrompt and completion rates
ProvidersAll serving providers

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Production choice

Pick a default model. Keep fallback enabled.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

OpenAI clientPython

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key="sk-tr-v1-..."
)

response = client.chat.completions.create(
    model="cerebras/gemma-4-31b",
    messages=messages,
)

Questions

Which should I use, Gemma 4 31B or OpenAI: gpt-oss-120b?

Is Gemma 4 31B or OpenAI: gpt-oss-120b cheaper?

The current cheapest TrustedRouter route is $2.6164/1M for Gemma 4 31B and $0.211/1M for OpenAI: gpt-oss-120b. The comparison uses current catalog prices and updates as provider pricing changes.

Is Gemma 4 31B or OpenAI: gpt-oss-120b faster?

Current measured p50 time to first token is 790 ms for Gemma 4 31B and 703 ms for OpenAI: gpt-oss-120b. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test Gemma 4 31B and OpenAI: gpt-oss-120b with the same API?

Yes. Use the same OpenAI-compatible TrustedRouter base URL and API key, then change only the model id between cerebras/gemma-4-31b and openai/gpt-oss-120b. This makes side-by-side evals possible without maintaining two provider integrations.